Quick answer: Eating grass is a very common and usually normal dog behavior. Dogs may eat grass because they like the taste and texture, because they are bored, out of ancient instinct or sometimes because they have an upset stomach. Only a small portion of dogs vomit afterward. The main risks are lawn chemicals, parasites, toxic plants mixed in with grass and sharp grass seeds. To reduce grass eating, add exercise and enrichment, teach leave it and keep dogs off treated lawns. Call your vet if grass eating is sudden, frantic or comes with frequent vomiting, diarrhea or other signs of illness.

Is it normal for dogs to eat grass?

Yes, very. Grass eating is extremely common in dogs. In one well known survey of dog owners, a large majority said their dogs ate plants, with grass being the most common choice. Most of those dogs seemed healthy and did not vomit afterward. Vets generally consider occasional grass eating a normal dog behavior.

Wild relatives do it too. Wolves and other wild canines have been observed eating plants, including grass. Some scientists think plant eating may have helped wild canines clear intestinal parasites, which may explain why the habit has stuck around.

Dogs are not strict carnivores. Dogs are omnivores, which means they can eat and digest a mix of meat and plant foods. Grass is not a big part of their diet, but nibbling on it now and then is not unusual.

Some dogs just like it. Many dogs seem to enjoy the taste and texture of fresh grass, especially new spring growth. For these dogs, grass may simply be a crunchy, juicy snack.

Why do dogs eat grass?

Taste and texture. Some dogs simply like it. Fresh, tender grass in spring and after rain is especially popular.

Boredom. Dogs who do not get enough exercise or mental stimulation may eat grass to pass the time, especially when left alone in the yard.

Instinct. As mentioned, eating plants may be an ancient behavior that helped wild canines.

Upset stomach. Some dogs eat grass when they feel nauseous. Some vomit afterward, though it is not clear whether the grass causes the vomiting or the dog was already about to vomit.

Do dogs eat grass to make themselves throw up?

Sometimes, but not usually. Studies suggest that only a small portion of dogs vomit after eating grass, and most dogs who eat grass do not seem sick beforehand.

Fast gulping is a clue. Dogs who seem frantic and gulp grass quickly may be feeling nauseous.

Slow grazing is usually normal. Dogs who calmly nibble grass are often just enjoying it.

Watch other signs. If your dog vomits often, seems uncomfortable or has diarrhea, call your vet. Our guide on dog upset stomach explains what to watch for.

Does grass eating mean my dog is missing something in their diet?

Probably not, if they eat a complete diet. Some people think dogs eat grass because they need more fiber or nutrients. A complete, balanced dog food meets most dogs' needs.

Fiber may play a role for some dogs. In some cases, adding fiber to the diet has reduced grass eating. Ask your vet before changing your dog's food.

Do not add supplements without advice. Your vet can help decide if a diet change is needed. Our guide on how to choose the right dog food has more tips.

Watch for pica. Eating lots of non food items, like rocks, sticks or fabric, is called pica and may be a sign of a health or behavior problem.

Can boredom cause grass eating?

Yes. Dogs left alone in the yard with nothing to do may eat grass out of boredom.

Add enrichment. Give your dog toys, puzzle feeders and chews. Our guide on brain games for dogs has ideas.

Spend time outside together. Play fetch or tug in the yard instead of leaving your dog alone.

Daily walks. Regular walks with sniffing time reduce boredom.

Can stress make dogs eat grass?

Sometimes. Some dogs chew grass as a self soothing behavior, similar to chewing toys or licking.

Watch for other signs. Pacing, panting, licking and destructive behavior may suggest anxiety.

Build routines. Predictable routines help anxious dogs. Our guide on building a daily routine for your dog explains how.

Get help if needed. Talk to your vet or a behavior professional if anxiety is strong.

Is eating grass dangerous for dogs?

Lawn chemicals. Pesticides, herbicides and fertilizers can be toxic to dogs. Keep dogs off treated lawns and look for small warning flags. Our guide on spring lawn and garden safety for dogs explains safe yard care.

Parasites. Grass can be contaminated with eggs from intestinal parasites, especially in areas where many dogs go potty.

Toxic plants. Dogs may accidentally eat toxic plants mixed in with grass.

Grass awns and foxtails. Sharp seed heads can get stuck in the throat, nose or between toes.

When should I worry about my dog eating grass?

Sudden changes. A dog who suddenly starts eating lots of grass may be feeling unwell.

Frequent vomiting. Regular vomiting after grass eating needs a vet check.

Other signs. Diarrhea, weight loss, loss of appetite, lethargy or blood in stool or vomit are reasons to call your vet.

Frantic eating. Gulping grass desperately may mean nausea or tummy pain.

How do I stop my dog from eating grass?

Teach leave it. A solid leave it cue lets you stop grass eating on walks. Our guide on easy dog tricks to teach explains how.

Bring a distraction. Carry treats or a toy to redirect your dog's attention.

Keep walks moving. Gently guide your dog past tempting grassy areas.

Offer safe greens. Some owners grow dog safe wheatgrass or offer small amounts of dog safe veggies like green beans.

Can I grow safe grass for my dog?

Yes. Some owners grow wheatgrass or oat grass in pots for dogs who love to graze.

Keep it chemical free. Use pet safe soil and no pesticides.

Offer in moderation. Too much grass can still upset the stomach.

Supervise. Watch for vomiting or diarrhea.

Why do puppies eat grass?

Exploration. Puppies explore the world with their mouths.

Teething. Chewing can soothe sore gums. Our guide on puppy teething survival guide has more tips.

Boredom. Puppies need lots of activity and enrichment.

Teach leave it early. Start training as soon as possible.

Do dogs eat more grass at certain times of year?

Spring. Fresh spring grass is tender and tasty, and many dogs eat more of it.

After rain. Wet grass may smell more interesting.

Fall and winter. Some dogs eat less grass when it is dry or covered in snow.

Watch for seasonal hazards. Lawn treatments are common in spring and fall.

What does research say about dogs eating grass?

Plant eating is common in healthy dogs. Researchers at the University of California, Davis surveyed hundreds of dog owners about their dogs' plant eating habits. Most owners reported that their dogs ate plants regularly, and grass was by far the most common choice. Only a small number of dogs seemed sick before eating grass, and most did not vomit afterward. The researchers concluded that grass eating is a normal behavior in healthy dogs rather than a sign of illness.

Younger dogs graze more. The same research suggested that younger dogs tended to eat plants more often than older dogs and were less likely to appear sick beforehand. This fits with the idea that grass eating is often about curiosity, play and exploring the world.

The ancient parasite theory. One idea is that wild canines ate plants to help move intestinal worms through the gut, as undigested plant material wraps around parasites and carries them out. Modern dogs on parasite prevention do not need this help, but the instinct may remain.

More to learn. Scientists still do not fully understand all the reasons dogs eat grass. Every dog is a little different, which is why watching your own dog's habits and health is so important.

How can I make my yard safer for a grass eating dog?

Choose pet safe lawn care. If your dog loves to graze, consider skipping chemical weed killers and pesticides, or use products labeled as safe for pets. Always follow label directions and keep your dog off treated areas for as long as the label recommends. Ask lawn care companies to use pet safe products and tell you when they will treat the yard.

Remove toxic plants. Check your yard for plants that are toxic to dogs, like sago palms, lilies of the valley, foxglove, azaleas and certain bulbs such as daffodils and tulips. The ASPCA keeps a helpful list of toxic and non toxic plants.

Mow regularly. Keeping grass short reduces seed heads, foxtails and other grass awns that can get stuck in your dog's nose, ears, throat and paws.

Pick up poop. Clearing poop from the yard regularly reduces the risk of parasites spreading through grass. Our guide on flea and tick prevention for dogs also explains how to reduce pests in the yard.

How do I manage grass eating on walks?

Avoid unknown grass. You often cannot tell if grass in parks, along sidewalks or in neighbors' yards has been treated with chemicals. It is safest to keep your dog from grazing on grass you do not know.

Keep a short leash near grassy edges. Shorten the leash a little as you pass tempting patches. Keep walking calmly and reward your dog for staying with you.

Give sniff breaks instead. Many dogs dive for grass because they want to explore. Let your dog sniff to their heart's content, just without eating. Sniffing is wonderful enrichment and helps satisfy curiosity.

Reward check ins. Every time your dog looks at you instead of the grass, reward them with a treat. Over time, many dogs learn that walking with you is more rewarding than grazing.

What if my dog eats other plants too?

Know which plants are dangerous. Some dogs move on from grass to houseplants, garden plants and flowers. Many common plants are toxic, including lilies of the valley, sago palms, oleander, azaleas, rhododendrons, foxglove, daffodil and tulip bulbs, aloe and some types of ivy. Signs of plant poisoning can include vomiting, diarrhea, drooling, trembling, weakness and changes in heart rate.

Move houseplants out of reach. Put houseplants on high shelves or in rooms your dog cannot enter. Choose pet safe plants like spider plants, Boston ferns, calathea and parlor palms if you love greenery indoors.

Fence off the garden. Use low fencing or raised beds to keep curious dogs out of vegetable and flower gardens. Some garden foods, like onions, garlic, chives, grapes and unripe tomatoes, are harmful to dogs.

Call for help fast. If your dog eats a plant and you are not sure if it is safe, call your vet or the ASPCA Animal Poison Control Center. Take a photo of the plant or bring a sample to help identify it.

Can eating a lot of grass cause problems?

Usually not, but it can. Most grass passes through without any trouble. You might notice it in your dog's poop, which is normal. Occasionally, dogs who eat large amounts of long, tough grass can develop stomach upset or, rarely, a blockage.

Watch for warning signs. Repeated vomiting, straining to poop, belly pain, a hunched posture, loss of appetite or lethargy can be signs of a problem. Call your vet if you notice these.

Help with stuck grass. Sometimes a long blade of grass gets partly stuck coming out the back end. If it does not come out easily with a gentle tug while wearing gloves, do not pull hard. Call your vet, as pulling can hurt your dog.

Limit big grazing sessions. If your dog tends to eat a lot of grass at once, cut grazing time short and keep them busy with other activities.

Signs your dog is a part time cow

The lawn mower. Your dog trims your lawn better than your mower.

The grass connoisseur. Your dog only eats one special kind of grass and ignores the rest.

The surprise souvenir. Your dog brings the grass back up on the nicest rug in the house.

The grazing stare. Your dog chews slowly while staring at you, daring you to stop them.

Key facts about dogs eating grass

It is very common. Most dogs who eat grass are healthy.

Only some vomit afterward. Grass eating is not usually a sign of illness.

Watch for lawn chemicals. Keep dogs off treated grass.

Call your vet for sudden or frequent grass eating. Especially with vomiting or diarrhea.

• Grass eating is usually normal.
• Few dogs vomit afterward.
• Lawn chemicals are the real risk.
• Boredom can drive grazing.
• Sudden or frantic needs a vet check.

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Is it normal for dogs to eat grass?

Yes. Grass eating is very common and usually harmless.

Why does my dog eat grass and throw up?

Some dogs eat grass when nauseous, but most dogs who eat grass do not vomit.

Should I stop my dog from eating grass?

Occasional grazing is fine on untreated grass. Stop it if lawns are treated or your dog vomits often.

Does eating grass mean my dog needs more fiber?

Possibly for some dogs. Ask your vet before changing food.

Is grass bad for dogs?

Grass itself is usually fine, but lawn chemicals, parasites and grass seeds can be harmful.

Why does my dog eat grass every day?

It may be taste, boredom or habit. Add enrichment and check with your vet if concerned.

Can grass eating cause blockages?

Large amounts of long grass can rarely cause problems. Watch for vomiting and constipation.

Why do puppies eat grass?

Puppies explore with their mouths and may be teething or bored.

Is wheatgrass safe for dogs?

In small amounts, chemical free wheatgrass is generally safe.

When should I call the vet about grass eating?

If it is sudden, frantic or comes with vomiting, diarrhea or weight loss.